BuildComponent class abstract base

A base component for assembling declarative UI Widget subtrees from multiple reactive dependencies (N:1).

BuildComponent bridges Coralline's reactive state computation with Flutter's declarative layout system by exposing a Flutter-friendly build method.

Design Philosophy: This class encapsulates the ComplexComputation computation contract to provide a familiar, Flutter-like developer experience (build()). However, it remains a true reactive node within Coralline's topological pipeline rather than a Flutter Widget. It computes the UI subtree lazily when marked dirty by its reactive dependencies.

AI & Developer Note:

• Implement build instead of overriding compute. The compute method is marked @nonVirtual and forwards directly to build.
• Do not store dynamic UI state in local mutable fields. Always derive UI declaratively from reactive Coral streams to maintain topological purity and prevent state synchronization bugs.
• Ensure all reactive dependencies accessed within build are declared in manifest.
• For single-dependency (1:1) UI components, consider using SimplexBuildComponent for zero-allocation performance.

Example:

base class CounterViewComp extends BuildComponent {
  CounterViewComp({required this.count});

  final Coral<int> count;

  @override
  @manifestSync
  Iterable<CoralNode> manifest() => [count];

  @override
  Widget build() {
    return Text('Count: ${count.data}');
  }
}